I can verify a similar problem on a Dell Inspiron e1505:

Using the Fn Brightness controls (Fn Arrow Up/Down) causes X not to
register keystrokes in programs, and ceases OSD of volume/brightness
events (OSD for battery WiFi et al never worked - not sure it's supposed
to?). Also submenus and right-clicks cease to work.

Toggling to Terminal and back to GUI (Ctrl-Alt F1/F7) restores
keyboard/clicking functionality.

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[Intrepid] On DELL Inspiron 9400 some Fn+keys don't work (instead creates a 
tight loop of KeyPress/KeyRelease events in xev)
https://bugs.launchpad.net/bugs/288579
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